UL 726
Standard for Oil-Fired Boiler Assemblies

DETAILS
Edition Number:7SCC Approved:--
Edition Date:1995-11-30DOD Approved: 1992-01-27
Price Code:AANSI Approved: --
Type:ulstd

  • SCOPE

    1 Scope

    1.1 These requirements apply to oil-fired boiler assemblies.

    1.2 Requirements for the installation and use of oil-burning equipment are included in the Standard of the National Fire Protection Association for the Installation of Oil-Burning Equipment, NFPA No. 31.

    1.3 Deleted February 24, 2006

  • TABLE OF CONTENTS
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    • Cover
    • Transmittal
    • Table of Contents
    • UL Foreword
      • Body
        • INTRODUCTION
          • 1 Scope
          • 2 General
          • 3 Glossary
          • 3A Undated References
          • 4 Components
        • CONSTRUCTION
          • 5 Assembly
          • 6 Accessibility for Servicing
          • 6A Air-Intake Terminal
          • 6B Vent-Air Intake Assemblies
          • 7 Casing
          • 8 Radiation Shields or Liners
          • 9 Combustion Chamber
          • 10 Baffles
          • 11 Flue collar
          • 12 Damper and Draft Regulator
          • 13 Controls
            • 13.1 Application
            • 13.2 Limit controls
            • 13.3 Primary safety control
            • 13.4 Liquid level limit controls
            • 13.5 Pressure limit controls
            • 13.6 Temperature limit controls
            • 13.7 Purge and combustion air monitoring controls
            • 13.8 Safety shut-off valves
          • 14 Installation of External Controls and Fittings
          • 15 Field Wiring
            • 15.1 General
            • 15.2 Leads and Terminals
          • 16 Internal Wiring
            • 16.1 General
            • 16.2 Short-circuit protection
          • 17 Separation of Circuits
          • 18 Bonding for Grounding
        • ELECTRICAL COMPONENTS
          • 19 General Components and Devices
          • 20 Mounting of Electrical Components
          • 21 Electrical Enclosures
            • 21.1 General
            • 21.2 Accessibility of uninsulated live parts and film-coated wire
            • 21.3 Boilers having an input in excess of 3 gph (11.4 L/h)
            • 21.4 Boilers having an input of 3 gph (11.4 L/h) or Less
            • 21.5 Doors and covers
            • 21.6 Field wiring system connection
          • 22 Motors and Motor Overload Protection
          • 23 Overcurrent Protection of High-Voltage Control-Circuit Conductors
            • 23.1 General
            • 23.2 Direct-connected high-voltage control circuit
            • 23.3 Tapped high-voltage control circuits
            • 23.4 Overcurrent-protective devices
          • 24 Overcurrent Protection of Transformers
            • 24.1 High-voltage transformers
            • 24.2 Low-voltage transformers
          • 25 Switches and Controllers
          • 26 Capacitors
          • 27 Insulating Material
        • SPACINGS
          • 28 High-Voltage Circuits
          • 29 Low-Voltage Circuits
        • PROTECTION OF USERS AND SERVICE PERSONNEL
          • 30 General
        • PERFORMANCE
          • 31 General
          • 32 Test Installation for Standard Clearances
            • 32.1 Enclosure
            • 32.2 Chimney connector
          • 33 Test Installation for Alcove or Closet
            • 33.1 Enclosure
            • 33.2 Chimney connector
          • 34 Instrumentation
            • 34.1 Draft
            • 34.2 Fuel input
            • 34.3 Power measurement
            • 34.4 Speed measurement
            • 34.5 Temperature measurement
          • 35 Initial Test Conditions
          • 36 Combustion Test – Burner and Boiler
          • 37 Operation Tests
          • 38 Limit Control Cutout Test
          • 39 Temperature Tests
          • 39A Low Water Cutoff of Boilers Test
          • 40 Continuous Operation Test
          • 41 Short-Circuit Test
          • 42 Overload Test, High-Voltage Transformers
          • 43 Burnout Test, High-Voltage Transformers
          • 43A Direct Vent System Leakage Test
          • 43B Wind Tests
          • 43C Rain Test
          • 43D Load Test
          • 43E Impact Test
          • 44 Dielectric Voltage-Withstand Test
        • MANUFACTURING AND PRODUCTION TESTS
          • 45 General
          • 46 Production Line Dielectric Withstand Test
        • MARKING
          • 47 General
        • INSTALLATION INSTRUCTIONS
          • 48 General
    • APPENDIX A